Position size calculator
Enter your deposit, acceptable risk and trade levels — the calculator shows the position size at which a triggered stop costs exactly the chosen share of the deposit.
Result
The calculator performs an arithmetic estimate based on the values you enter and is not investment advice. Exact contract parameters are set by each exchange — check its specification.
Screeners find the move — you decide on the trade
JustScreener watches price, volume, open interest and funding across every pair on 9 exchanges and sends a notification when something changes noticeably.
How it is calculated
The calculation starts from risk, not from a desired size: first the amount you are willing to lose on the trade is fixed (a share of the deposit), then it is divided by the distance from entry to stop-loss. The resulting size guarantees that a triggered stop costs exactly the chosen share of the deposit — no matter how volatile the coin is.
The position notional can exceed the deposit — that is normal for futures and means leverage is needed to open the trade: the “notional to deposit” row shows how much. The reward-to-risk ratio (R:R) is computed from the distances to take-profit and stop-loss and does not include fees or slippage.
FAQ
What is risk per trade?
The share of the deposit lost if the stop-loss triggers. Sizing from a fixed risk equalizes losses across trades: a volatile coin gets a smaller size, a calm one a larger size.
How does the calculator detect the trade side?
From the stop-loss placement: a stop below the entry price means a long; a stop above it means a short. The take-profit is checked for consistency with the side.
What does the R:R ratio show?
The ratio of potential profit to the take-profit against the potential loss to the stop-loss. For example, 3:1 means the distance to the take is three times the distance to the stop. Fees and slippage are not included.